[FFmpeg-devel] [PATCH] avcodec: remove duplicate prores decoder

Paul B Mahol onemda at gmail.com
Thu Apr 26 16:14:08 EEST 2018


Removed slower one, couldn't figure out why it is slower.

Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
 libavcodec/Makefile         |   1 -
 libavcodec/allcodecs.c      |   1 -
 libavcodec/proresdec_lgpl.c | 786 --------------------------------------------
 3 files changed, 788 deletions(-)
 delete mode 100644 libavcodec/proresdec_lgpl.c

diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 4b8ad121db..d727b218dc 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -508,7 +508,6 @@ OBJS-$(CONFIG_PNG_ENCODER)             += png.o pngenc.o
 OBJS-$(CONFIG_PPM_DECODER)             += pnmdec.o pnm.o
 OBJS-$(CONFIG_PPM_ENCODER)             += pnmenc.o
 OBJS-$(CONFIG_PRORES_DECODER)          += proresdec2.o proresdsp.o proresdata.o
-OBJS-$(CONFIG_PRORES_LGPL_DECODER)     += proresdec_lgpl.o proresdsp.o proresdata.o
 OBJS-$(CONFIG_PRORES_ENCODER)          += proresenc_anatoliy.o
 OBJS-$(CONFIG_PRORES_AW_ENCODER)       += proresenc_anatoliy.o
 OBJS-$(CONFIG_PRORES_KS_ENCODER)       += proresenc_kostya.o proresdata.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 4d4ef530e4..102d99b7ea 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -234,7 +234,6 @@ extern AVCodec ff_prores_encoder;
 extern AVCodec ff_prores_decoder;
 extern AVCodec ff_prores_aw_encoder;
 extern AVCodec ff_prores_ks_encoder;
-extern AVCodec ff_prores_lgpl_decoder;
 extern AVCodec ff_psd_decoder;
 extern AVCodec ff_ptx_decoder;
 extern AVCodec ff_qdraw_decoder;
diff --git a/libavcodec/proresdec_lgpl.c b/libavcodec/proresdec_lgpl.c
deleted file mode 100644
index 3dbfb29011..0000000000
--- a/libavcodec/proresdec_lgpl.c
+++ /dev/null
@@ -1,786 +0,0 @@
-/*
- * Apple ProRes compatible decoder
- *
- * Copyright (c) 2010-2011 Maxim Poliakovski
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/**
- * @file
- * This is a decoder for Apple ProRes 422 SD/HQ/LT/Proxy and ProRes 4444.
- * It is used for storing and editing high definition video data in Apple's Final Cut Pro.
- *
- * @see http://wiki.multimedia.cx/index.php?title=Apple_ProRes
- */
-
-#define LONG_BITSTREAM_READER // some ProRes vlc codes require up to 28 bits to be read at once
-
-#include <stdint.h>
-
-#include "libavutil/intmath.h"
-#include "avcodec.h"
-#include "idctdsp.h"
-#include "internal.h"
-#include "proresdata.h"
-#include "proresdsp.h"
-#include "get_bits.h"
-
-typedef struct ProresThreadData {
-    const uint8_t *index;            ///< pointers to the data of this slice
-    int slice_num;
-    int x_pos, y_pos;
-    int slice_width;
-    int prev_slice_sf;               ///< scalefactor of the previous decoded slice
-    DECLARE_ALIGNED(16, int16_t, blocks)[8 * 4 * 64];
-    DECLARE_ALIGNED(16, int16_t, qmat_luma_scaled)[64];
-    DECLARE_ALIGNED(16, int16_t, qmat_chroma_scaled)[64];
-} ProresThreadData;
-
-typedef struct ProresContext {
-    ProresDSPContext dsp;
-    AVFrame    *frame;
-    ScanTable  scantable;
-    int        scantable_type;           ///< -1 = uninitialized, 0 = progressive, 1/2 = interlaced
-
-    int        frame_type;               ///< 0 = progressive, 1 = top-field first, 2 = bottom-field first
-    int        pic_format;               ///< 2 = 422, 3 = 444
-    uint8_t    qmat_luma[64];            ///< dequantization matrix for luma
-    uint8_t    qmat_chroma[64];          ///< dequantization matrix for chroma
-    int        qmat_changed;             ///< 1 - global quantization matrices changed
-    int        total_slices;            ///< total number of slices in a picture
-    ProresThreadData *slice_data;
-    int        pic_num;
-    int        chroma_factor;
-    int        mb_chroma_factor;
-    int        num_chroma_blocks;       ///< number of chrominance blocks in a macroblock
-    int        num_x_slices;
-    int        num_y_slices;
-    int        slice_width_factor;
-    int        slice_height_factor;
-    int        num_x_mbs;
-    int        num_y_mbs;
-    int        alpha_info;
-} ProresContext;
-
-
-static av_cold int decode_init(AVCodecContext *avctx)
-{
-    ProresContext *ctx = avctx->priv_data;
-
-    ctx->total_slices     = 0;
-    ctx->slice_data       = NULL;
-
-    avctx->bits_per_raw_sample = PRORES_BITS_PER_SAMPLE;
-    ff_proresdsp_init(&ctx->dsp, avctx);
-
-    ctx->scantable_type = -1;   // set scantable type to uninitialized
-    memset(ctx->qmat_luma, 4, 64);
-    memset(ctx->qmat_chroma, 4, 64);
-
-    return 0;
-}
-
-
-static int decode_frame_header(ProresContext *ctx, const uint8_t *buf,
-                               const int data_size, AVCodecContext *avctx)
-{
-    int hdr_size, version, width, height, flags;
-    const uint8_t *ptr;
-
-    hdr_size = AV_RB16(buf);
-    if (hdr_size > data_size) {
-        av_log(avctx, AV_LOG_ERROR, "frame data too small\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    version = AV_RB16(buf + 2);
-    if (version >= 2) {
-        av_log(avctx, AV_LOG_ERROR,
-               "unsupported header version: %d\n", version);
-        return AVERROR_INVALIDDATA;
-    }
-
-    width  = AV_RB16(buf + 8);
-    height = AV_RB16(buf + 10);
-    if (width != avctx->width || height != avctx->height) {
-        av_log(avctx, AV_LOG_ERROR,
-               "picture dimension changed: old: %d x %d, new: %d x %d\n",
-               avctx->width, avctx->height, width, height);
-        return AVERROR_INVALIDDATA;
-    }
-
-    ctx->frame_type = (buf[12] >> 2) & 3;
-    if (ctx->frame_type > 2) {
-        av_log(avctx, AV_LOG_ERROR,
-               "unsupported frame type: %d\n", ctx->frame_type);
-        return AVERROR_INVALIDDATA;
-    }
-
-    ctx->chroma_factor     = (buf[12] >> 6) & 3;
-    ctx->mb_chroma_factor  = ctx->chroma_factor + 2;
-    ctx->num_chroma_blocks = (1 << ctx->chroma_factor) >> 1;
-    ctx->alpha_info        = buf[17] & 0xf;
-
-    if (ctx->alpha_info > 2) {
-        av_log(avctx, AV_LOG_ERROR, "Invalid alpha mode %d\n", ctx->alpha_info);
-        return AVERROR_INVALIDDATA;
-    }
-    if (avctx->skip_alpha) ctx->alpha_info = 0;
-
-    switch (ctx->chroma_factor) {
-    case 2:
-        avctx->pix_fmt = ctx->alpha_info ? AV_PIX_FMT_YUVA422P10
-                                         : AV_PIX_FMT_YUV422P10;
-        break;
-    case 3:
-        avctx->pix_fmt = ctx->alpha_info ? AV_PIX_FMT_YUVA444P10
-                                         : AV_PIX_FMT_YUV444P10;
-        break;
-    default:
-        av_log(avctx, AV_LOG_ERROR,
-               "unsupported picture format: %d\n", ctx->pic_format);
-        return AVERROR_INVALIDDATA;
-    }
-
-    if (ctx->scantable_type != ctx->frame_type) {
-        if (!ctx->frame_type)
-            ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable,
-                              ff_prores_progressive_scan);
-        else
-            ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable,
-                              ff_prores_interlaced_scan);
-        ctx->scantable_type = ctx->frame_type;
-    }
-
-    if (ctx->frame_type) {      /* if interlaced */
-        ctx->frame->interlaced_frame = 1;
-        ctx->frame->top_field_first  = ctx->frame_type & 1;
-    } else {
-        ctx->frame->interlaced_frame = 0;
-    }
-
-    avctx->color_primaries = buf[14];
-    avctx->color_trc       = buf[15];
-    avctx->colorspace      = buf[16];
-    avctx->color_range     = AVCOL_RANGE_MPEG;
-
-    ctx->qmat_changed = 0;
-    ptr   = buf + 20;
-    flags = buf[19];
-    if (flags & 2) {
-        if (ptr - buf > hdr_size - 64) {
-            av_log(avctx, AV_LOG_ERROR, "header data too small\n");
-            return AVERROR_INVALIDDATA;
-        }
-        if (memcmp(ctx->qmat_luma, ptr, 64)) {
-            memcpy(ctx->qmat_luma, ptr, 64);
-            ctx->qmat_changed = 1;
-        }
-        ptr += 64;
-    } else {
-        memset(ctx->qmat_luma, 4, 64);
-        ctx->qmat_changed = 1;
-    }
-
-    if (flags & 1) {
-        if (ptr - buf > hdr_size - 64) {
-            av_log(avctx, AV_LOG_ERROR, "header data too small\n");
-            return -1;
-        }
-        if (memcmp(ctx->qmat_chroma, ptr, 64)) {
-            memcpy(ctx->qmat_chroma, ptr, 64);
-            ctx->qmat_changed = 1;
-        }
-    } else {
-        memset(ctx->qmat_chroma, 4, 64);
-        ctx->qmat_changed = 1;
-    }
-
-    return hdr_size;
-}
-
-
-static int decode_picture_header(ProresContext *ctx, const uint8_t *buf,
-                                 const int data_size, AVCodecContext *avctx)
-{
-    int   i, hdr_size, pic_data_size, num_slices;
-    int   slice_width_factor, slice_height_factor;
-    int   remainder, num_x_slices;
-    const uint8_t *data_ptr, *index_ptr;
-
-    hdr_size = data_size > 0 ? buf[0] >> 3 : 0;
-    if (hdr_size < 8 || hdr_size > data_size) {
-        av_log(avctx, AV_LOG_ERROR, "picture header too small\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    pic_data_size = AV_RB32(buf + 1);
-    if (pic_data_size > data_size) {
-        av_log(avctx, AV_LOG_ERROR, "picture data too small\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    slice_width_factor  = buf[7] >> 4;
-    slice_height_factor = buf[7] & 0xF;
-    if (slice_width_factor > 3 || slice_height_factor) {
-        av_log(avctx, AV_LOG_ERROR,
-               "unsupported slice dimension: %d x %d\n",
-               1 << slice_width_factor, 1 << slice_height_factor);
-        return AVERROR_INVALIDDATA;
-    }
-
-    ctx->slice_width_factor  = slice_width_factor;
-    ctx->slice_height_factor = slice_height_factor;
-
-    ctx->num_x_mbs = (avctx->width + 15) >> 4;
-    ctx->num_y_mbs = (avctx->height +
-                      (1 << (4 + ctx->frame->interlaced_frame)) - 1) >>
-                     (4 + ctx->frame->interlaced_frame);
-
-    remainder    = av_mod_uintp2(ctx->num_x_mbs, slice_width_factor);
-    num_x_slices = (ctx->num_x_mbs >> slice_width_factor) + (remainder & 1) +
-                   ((remainder >> 1) & 1) + ((remainder >> 2) & 1);
-
-    num_slices = num_x_slices * ctx->num_y_mbs;
-    if (num_slices != AV_RB16(buf + 5)) {
-        av_log(avctx, AV_LOG_ERROR, "invalid number of slices\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    if (ctx->total_slices != num_slices) {
-        av_freep(&ctx->slice_data);
-        ctx->slice_data = av_malloc_array(num_slices + 1, sizeof(ctx->slice_data[0]));
-        if (!ctx->slice_data)
-            return AVERROR(ENOMEM);
-        ctx->total_slices = num_slices;
-    }
-
-    if (hdr_size + num_slices * 2 > data_size) {
-        av_log(avctx, AV_LOG_ERROR, "slice table too small\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    /* parse slice table allowing quick access to the slice data */
-    index_ptr = buf + hdr_size;
-    data_ptr = index_ptr + num_slices * 2;
-
-    for (i = 0; i < num_slices; i++) {
-        ctx->slice_data[i].index = data_ptr;
-        ctx->slice_data[i].prev_slice_sf = 0;
-        data_ptr += AV_RB16(index_ptr + i * 2);
-    }
-    ctx->slice_data[i].index = data_ptr;
-    ctx->slice_data[i].prev_slice_sf = 0;
-
-    if (data_ptr > buf + data_size) {
-        av_log(avctx, AV_LOG_ERROR, "out of slice data\n");
-        return -1;
-    }
-
-    return pic_data_size;
-}
-
-
-/**
- * Read an unsigned rice/exp golomb codeword.
- */
-static inline int decode_vlc_codeword(GetBitContext *gb, unsigned codebook)
-{
-    unsigned int rice_order, exp_order, switch_bits;
-    unsigned int buf, code;
-    int log, prefix_len, len;
-
-    OPEN_READER(re, gb);
-    UPDATE_CACHE(re, gb);
-    buf = GET_CACHE(re, gb);
-
-    /* number of prefix bits to switch between Rice and expGolomb */
-    switch_bits = (codebook & 3) + 1;
-    rice_order  = codebook >> 5;        /* rice code order */
-    exp_order   = (codebook >> 2) & 7;  /* exp golomb code order */
-
-    log = 31 - av_log2(buf); /* count prefix bits (zeroes) */
-
-    if (log < switch_bits) { /* ok, we got a rice code */
-        if (!rice_order) {
-            /* shortcut for faster decoding of rice codes without remainder */
-            code = log;
-            LAST_SKIP_BITS(re, gb, log + 1);
-        } else {
-            prefix_len = log + 1;
-            code = (log << rice_order) + NEG_USR32(buf << prefix_len, rice_order);
-            LAST_SKIP_BITS(re, gb, prefix_len + rice_order);
-        }
-    } else { /* otherwise we got a exp golomb code */
-        len  = (log << 1) - switch_bits + exp_order + 1;
-        code = NEG_USR32(buf, len) - (1 << exp_order) + (switch_bits << rice_order);
-        LAST_SKIP_BITS(re, gb, len);
-    }
-
-    CLOSE_READER(re, gb);
-
-    return code;
-}
-
-#define LSB2SIGN(x) (-((x) & 1))
-#define TOSIGNED(x) (((x) >> 1) ^ LSB2SIGN(x))
-
-/**
- * Decode DC coefficients for all blocks in a slice.
- */
-static inline void decode_dc_coeffs(GetBitContext *gb, int16_t *out,
-                                    int nblocks)
-{
-    int16_t prev_dc;
-    int     i, sign;
-    int16_t delta;
-    unsigned int code;
-
-    code   = decode_vlc_codeword(gb, FIRST_DC_CB);
-    out[0] = prev_dc = TOSIGNED(code);
-
-    out   += 64; /* move to the DC coeff of the next block */
-    delta  = 3;
-
-    for (i = 1; i < nblocks; i++, out += 64) {
-        code = decode_vlc_codeword(gb, ff_prores_dc_codebook[FFMIN(FFABS(delta), 3)]);
-
-        sign     = -(((delta >> 15) & 1) ^ (code & 1));
-        delta    = (((code + 1) >> 1) ^ sign) - sign;
-        prev_dc += delta;
-        out[0]   = prev_dc;
-    }
-}
-
-#define MAX_PADDING 16
-
-/**
- * Decode AC coefficients for all blocks in a slice.
- */
-static inline int decode_ac_coeffs(GetBitContext *gb, int16_t *out,
-                                   int blocks_per_slice,
-                                   int plane_size_factor,
-                                   const uint8_t *scan)
-{
-    int pos, block_mask, run, level, sign, run_cb_index, lev_cb_index;
-    int max_coeffs, bits_left;
-
-    /* set initial prediction values */
-    run   = 4;
-    level = 2;
-
-    max_coeffs = blocks_per_slice << 6;
-    block_mask = blocks_per_slice - 1;
-
-    for (pos = blocks_per_slice - 1; pos < max_coeffs;) {
-        run_cb_index = ff_prores_run_to_cb_index[FFMIN(run, 15)];
-        lev_cb_index = ff_prores_lev_to_cb_index[FFMIN(level, 9)];
-
-        bits_left = get_bits_left(gb);
-        if (bits_left <= 0 || (bits_left <= MAX_PADDING && !show_bits(gb, bits_left)))
-            return 0;
-
-        run = decode_vlc_codeword(gb, ff_prores_ac_codebook[run_cb_index]);
-        if (run < 0)
-            return AVERROR_INVALIDDATA;
-
-        bits_left = get_bits_left(gb);
-        if (bits_left <= 0 || (bits_left <= MAX_PADDING && !show_bits(gb, bits_left)))
-            return AVERROR_INVALIDDATA;
-
-        level = decode_vlc_codeword(gb, ff_prores_ac_codebook[lev_cb_index]) + 1;
-        if (level < 0)
-            return AVERROR_INVALIDDATA;
-
-        pos += run + 1;
-        if (pos >= max_coeffs)
-            break;
-
-        sign = get_sbits(gb, 1);
-        out[((pos & block_mask) << 6) + scan[pos >> plane_size_factor]] =
-            (level ^ sign) - sign;
-    }
-
-    return 0;
-}
-
-
-/**
- * Decode a slice plane (luma or chroma).
- */
-static int decode_slice_plane(ProresContext *ctx, ProresThreadData *td,
-                              const uint8_t *buf,
-                              int data_size, uint16_t *out_ptr,
-                              int linesize, int mbs_per_slice,
-                              int blocks_per_mb, int plane_size_factor,
-                              const int16_t *qmat, int is_chroma)
-{
-    GetBitContext gb;
-    int16_t *block_ptr;
-    int mb_num, blocks_per_slice, ret;
-
-    blocks_per_slice = mbs_per_slice * blocks_per_mb;
-
-    memset(td->blocks, 0, 8 * 4 * 64 * sizeof(*td->blocks));
-
-    init_get_bits(&gb, buf, data_size << 3);
-
-    decode_dc_coeffs(&gb, td->blocks, blocks_per_slice);
-
-    ret = decode_ac_coeffs(&gb, td->blocks, blocks_per_slice,
-                           plane_size_factor, ctx->scantable.permutated);
-    if (ret < 0)
-        return ret;
-
-    /* inverse quantization, inverse transform and output */
-    block_ptr = td->blocks;
-
-    if (!is_chroma) {
-        for (mb_num = 0; mb_num < mbs_per_slice; mb_num++, out_ptr += blocks_per_mb * 4) {
-            ctx->dsp.idct_put(out_ptr,                    linesize, block_ptr, qmat);
-            block_ptr += 64;
-            if (blocks_per_mb > 2) {
-                ctx->dsp.idct_put(out_ptr + 8,            linesize, block_ptr, qmat);
-                block_ptr += 64;
-            }
-            ctx->dsp.idct_put(out_ptr + linesize * 4,     linesize, block_ptr, qmat);
-            block_ptr += 64;
-            if (blocks_per_mb > 2) {
-                ctx->dsp.idct_put(out_ptr + linesize * 4 + 8, linesize, block_ptr, qmat);
-                block_ptr += 64;
-            }
-        }
-    } else {
-        for (mb_num = 0; mb_num < mbs_per_slice; mb_num++, out_ptr += blocks_per_mb * 4) {
-            ctx->dsp.idct_put(out_ptr,                    linesize, block_ptr, qmat);
-            block_ptr += 64;
-            ctx->dsp.idct_put(out_ptr + linesize * 4,     linesize, block_ptr, qmat);
-            block_ptr += 64;
-            if (blocks_per_mb > 2) {
-                ctx->dsp.idct_put(out_ptr + 8,            linesize, block_ptr, qmat);
-                block_ptr += 64;
-                ctx->dsp.idct_put(out_ptr + linesize * 4 + 8, linesize, block_ptr, qmat);
-                block_ptr += 64;
-            }
-        }
-    }
-    return 0;
-}
-
-
-static void unpack_alpha(GetBitContext *gb, uint16_t *dst, int num_coeffs,
-                         const int num_bits)
-{
-    const int mask = (1 << num_bits) - 1;
-    int i, idx, val, alpha_val;
-
-    idx       = 0;
-    alpha_val = mask;
-    do {
-        do {
-            if (get_bits1(gb))
-                val = get_bits(gb, num_bits);
-            else {
-                int sign;
-                val  = get_bits(gb, num_bits == 16 ? 7 : 4);
-                sign = val & 1;
-                val  = (val + 2) >> 1;
-                if (sign)
-                    val = -val;
-            }
-            alpha_val = (alpha_val + val) & mask;
-            if (num_bits == 16)
-                dst[idx++] = alpha_val >> 6;
-            else
-                dst[idx++] = (alpha_val << 2) | (alpha_val >> 6);
-            if (idx >= num_coeffs) {
-                break;
-            }
-        } while (get_bits1(gb));
-        val = get_bits(gb, 4);
-        if (!val)
-            val = get_bits(gb, 11);
-        if (idx + val > num_coeffs)
-            val = num_coeffs - idx;
-        if (num_bits == 16)
-            for (i = 0; i < val; i++)
-                dst[idx++] = alpha_val >> 6;
-        else
-            for (i = 0; i < val; i++)
-                dst[idx++] = (alpha_val << 2) | (alpha_val >> 6);
-    } while (idx < num_coeffs);
-}
-
-/**
- * Decode alpha slice plane.
- */
-static void decode_alpha_plane(ProresContext *ctx, ProresThreadData *td,
-                               const uint8_t *buf, int data_size,
-                               uint16_t *out_ptr, int linesize,
-                               int mbs_per_slice)
-{
-    GetBitContext gb;
-    int i;
-    uint16_t *block_ptr;
-
-    memset(td->blocks, 0, 8 * 4 * 64 * sizeof(*td->blocks));
-
-    init_get_bits(&gb, buf, data_size << 3);
-
-    if (ctx->alpha_info == 2)
-        unpack_alpha(&gb, td->blocks, mbs_per_slice * 4 * 64, 16);
-    else
-        unpack_alpha(&gb, td->blocks, mbs_per_slice * 4 * 64, 8);
-
-    block_ptr = td->blocks;
-
-    for (i = 0; i < 16; i++) {
-        memcpy(out_ptr, block_ptr, 16 * mbs_per_slice * sizeof(*out_ptr));
-        out_ptr   += linesize >> 1;
-        block_ptr += 16 * mbs_per_slice;
-    }
-}
-
-static int decode_slice(AVCodecContext *avctx, void *tdata)
-{
-    ProresThreadData *td = tdata;
-    ProresContext *ctx = avctx->priv_data;
-    int mb_x_pos  = td->x_pos;
-    int mb_y_pos  = td->y_pos;
-    int pic_num   = ctx->pic_num;
-    int slice_num = td->slice_num;
-    int mbs_per_slice = td->slice_width;
-    const uint8_t *buf;
-    uint8_t *y_data, *u_data, *v_data, *a_data;
-    AVFrame *pic = ctx->frame;
-    int i, sf, slice_width_factor;
-    int slice_data_size, hdr_size;
-    int y_data_size, u_data_size, v_data_size, a_data_size;
-    int y_linesize, u_linesize, v_linesize, a_linesize;
-    int coff[4];
-    int ret;
-
-    buf             = ctx->slice_data[slice_num].index;
-    slice_data_size = ctx->slice_data[slice_num + 1].index - buf;
-
-    slice_width_factor = av_log2(mbs_per_slice);
-
-    y_data     = pic->data[0];
-    u_data     = pic->data[1];
-    v_data     = pic->data[2];
-    a_data     = pic->data[3];
-    y_linesize = pic->linesize[0];
-    u_linesize = pic->linesize[1];
-    v_linesize = pic->linesize[2];
-    a_linesize = pic->linesize[3];
-
-    if (pic->interlaced_frame) {
-        if (!(pic_num ^ pic->top_field_first)) {
-            y_data += y_linesize;
-            u_data += u_linesize;
-            v_data += v_linesize;
-            if (a_data)
-                a_data += a_linesize;
-        }
-        y_linesize <<= 1;
-        u_linesize <<= 1;
-        v_linesize <<= 1;
-        a_linesize <<= 1;
-    }
-    y_data += (mb_y_pos << 4) * y_linesize + (mb_x_pos << 5);
-    u_data += (mb_y_pos << 4) * u_linesize + (mb_x_pos << ctx->mb_chroma_factor);
-    v_data += (mb_y_pos << 4) * v_linesize + (mb_x_pos << ctx->mb_chroma_factor);
-    if (a_data)
-        a_data += (mb_y_pos << 4) * a_linesize + (mb_x_pos << 5);
-
-    if (slice_data_size < 6) {
-        av_log(avctx, AV_LOG_ERROR, "slice data too small\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    /* parse slice header */
-    hdr_size    = buf[0] >> 3;
-    coff[0]     = hdr_size;
-    y_data_size = AV_RB16(buf + 2);
-    coff[1]     = coff[0] + y_data_size;
-    u_data_size = AV_RB16(buf + 4);
-    coff[2]     = coff[1] + u_data_size;
-    v_data_size = hdr_size > 7 ? AV_RB16(buf + 6) : slice_data_size - coff[2];
-    coff[3]     = coff[2] + v_data_size;
-    a_data_size = ctx->alpha_info ? slice_data_size - coff[3] : 0;
-
-    /* if V or alpha component size is negative that means that previous
-       component sizes are too large */
-    if (v_data_size < 0 || a_data_size < 0 || hdr_size < 6 || coff[3] > slice_data_size) {
-        av_log(avctx, AV_LOG_ERROR, "invalid data size\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    sf = av_clip(buf[1], 1, 224);
-    sf = sf > 128 ? (sf - 96) << 2 : sf;
-
-    /* scale quantization matrixes according with slice's scale factor */
-    /* TODO: this can be SIMD-optimized a lot */
-    if (ctx->qmat_changed || sf != td->prev_slice_sf) {
-        td->prev_slice_sf = sf;
-        for (i = 0; i < 64; i++) {
-            td->qmat_luma_scaled[ctx->dsp.idct_permutation[i]]   = ctx->qmat_luma[i]   * sf;
-            td->qmat_chroma_scaled[ctx->dsp.idct_permutation[i]] = ctx->qmat_chroma[i] * sf;
-        }
-    }
-
-    /* decode luma plane */
-    ret = decode_slice_plane(ctx, td, buf + coff[0], y_data_size,
-                             (uint16_t*) y_data, y_linesize,
-                             mbs_per_slice, 4, slice_width_factor + 2,
-                             td->qmat_luma_scaled, 0);
-
-    if (ret < 0)
-        return ret;
-
-    /* decode U chroma plane */
-    ret = decode_slice_plane(ctx, td, buf + coff[1], u_data_size,
-                             (uint16_t*) u_data, u_linesize,
-                             mbs_per_slice, ctx->num_chroma_blocks,
-                             slice_width_factor + ctx->chroma_factor - 1,
-                             td->qmat_chroma_scaled, 1);
-    if (ret < 0)
-        return ret;
-
-    /* decode V chroma plane */
-    ret = decode_slice_plane(ctx, td, buf + coff[2], v_data_size,
-                             (uint16_t*) v_data, v_linesize,
-                             mbs_per_slice, ctx->num_chroma_blocks,
-                             slice_width_factor + ctx->chroma_factor - 1,
-                             td->qmat_chroma_scaled, 1);
-    if (ret < 0)
-        return ret;
-
-    /* decode alpha plane if available */
-    if (a_data && a_data_size)
-        decode_alpha_plane(ctx, td, buf + coff[3], a_data_size,
-                           (uint16_t*) a_data, a_linesize,
-                           mbs_per_slice);
-
-    return 0;
-}
-
-
-static int decode_picture(ProresContext *ctx, int pic_num,
-                          AVCodecContext *avctx)
-{
-    int slice_num, slice_width, x_pos, y_pos;
-
-    slice_num = 0;
-
-    ctx->pic_num = pic_num;
-    for (y_pos = 0; y_pos < ctx->num_y_mbs; y_pos++) {
-        slice_width = 1 << ctx->slice_width_factor;
-
-        for (x_pos = 0; x_pos < ctx->num_x_mbs && slice_width;
-             x_pos += slice_width) {
-            while (ctx->num_x_mbs - x_pos < slice_width)
-                slice_width >>= 1;
-
-            ctx->slice_data[slice_num].slice_num   = slice_num;
-            ctx->slice_data[slice_num].x_pos       = x_pos;
-            ctx->slice_data[slice_num].y_pos       = y_pos;
-            ctx->slice_data[slice_num].slice_width = slice_width;
-
-            slice_num++;
-        }
-    }
-
-    return avctx->execute(avctx, decode_slice,
-                          ctx->slice_data, NULL, slice_num,
-                          sizeof(ctx->slice_data[0]));
-}
-
-
-#define MOVE_DATA_PTR(nbytes) buf += (nbytes); buf_size -= (nbytes)
-
-static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
-                        AVPacket *avpkt)
-{
-    ProresContext *ctx = avctx->priv_data;
-    const uint8_t *buf = avpkt->data;
-    int buf_size       = avpkt->size;
-    int frame_hdr_size, pic_num, pic_data_size;
-    int ret;
-
-    ctx->frame            = data;
-    ctx->frame->pict_type = AV_PICTURE_TYPE_I;
-    ctx->frame->key_frame = 1;
-
-    /* check frame atom container */
-    if (buf_size < 28 || buf_size < AV_RB32(buf) ||
-        AV_RB32(buf + 4) != FRAME_ID) {
-        av_log(avctx, AV_LOG_ERROR, "invalid frame\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    MOVE_DATA_PTR(8);
-
-    frame_hdr_size = decode_frame_header(ctx, buf, buf_size, avctx);
-    if (frame_hdr_size < 0)
-        return AVERROR_INVALIDDATA;
-
-    MOVE_DATA_PTR(frame_hdr_size);
-
-    if ((ret = ff_get_buffer(avctx, ctx->frame, 0)) < 0)
-        return ret;
-
-    for (pic_num = 0; ctx->frame->interlaced_frame - pic_num + 1; pic_num++) {
-        pic_data_size = decode_picture_header(ctx, buf, buf_size, avctx);
-        if (pic_data_size < 0)
-            return AVERROR_INVALIDDATA;
-
-        if ((ret = decode_picture(ctx, pic_num, avctx)) < 0)
-            return ret;
-
-        MOVE_DATA_PTR(pic_data_size);
-    }
-
-    ctx->frame = NULL;
-    *got_frame = 1;
-
-    return avpkt->size;
-}
-
-
-static av_cold int decode_close(AVCodecContext *avctx)
-{
-    ProresContext *ctx = avctx->priv_data;
-
-    av_freep(&ctx->slice_data);
-
-    return 0;
-}
-
-
-AVCodec ff_prores_lgpl_decoder = {
-    .name           = "prores_lgpl",
-    .long_name      = NULL_IF_CONFIG_SMALL("Apple ProRes (iCodec Pro)"),
-    .type           = AVMEDIA_TYPE_VIDEO,
-    .id             = AV_CODEC_ID_PRORES,
-    .priv_data_size = sizeof(ProresContext),
-    .init           = decode_init,
-    .close          = decode_close,
-    .decode         = decode_frame,
-    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
-};
-- 
2.11.0



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